Some shit I find interesting and haven't found much info on: Left A340E out of any 96-02 4runner (sure there r more crossovers but as I haven't torn them apart personnal I don't want to speak to what I haven't confirmed) Right A340E out of a Aristo TT (as fas as I have found the only factory heavy duty A340 made). The TT A340 comes with extra clutches, stronger internals, larger front pump 23%ish increase in flow. Looks like there r many upgrades that the highend rebuild places use, like that added clutches, that one could get and install into the non TT A340 (i've pulled and measured the front clutch pack and it's a direct swap as is the front pump). The TT A340 output shaft seems to be unique to this model so u can't just pull a 4wd out and swap to the TT A340 (if someone has better info with maybe a later model A340 pls share). With those running dual tcases or other aftermaket Tcases u can run the TT A340 behind other engines, 2wd vehicles can also run said (haven't done it yet but plan to try and run TT A340 behind the 5vz with a stock tcase). The TT A340 runs a larger TC and bell-housing but it's very easy to swap parts to run what ever TC/housing one chooses. Don't have time to do a write-up but the interchange of bell-housing, front pump, TC, is fairly large, as is the ability to run diff VB (the TT A340 even has the hole to run a cable kick down if u desire).
U can c the diff in part quality